is the process of picking up information and relaying it to the brain. A. Sensation
B. Bottom-down processing
C. Bottom-up processing
D. Perception

Bottom-up processing is analysis that begins with the sensory receptors and works up to the brain's integration of sensory information. ... From the top down, we use preexisting knowledge or expectations to guide our perception and send our senses looking for stimuli that support those expectations.

Sensation is the process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment. ... Bottom-up processing is sensory analysis that begins at the entry level, with information flowing from the sensory receptors to the brain.

I would say that the answer is A sensation..

The answer to this will be from your lab notes/procedure. it would be best to ask another student who participated in the lab as we do not know what was done, what enzyme or if the temperature is celsius or fahrenheit. if i were to guess though i'd say the rate stopped due to enzyme denturing at high temperature